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E; J. STORY.

' FIRE CHAMBER. No. 372,774.

@LUITNEEE'EQ ilurrsn STATES PATENT rrice.

EPHRAIM J. STORY, OF WASHINGTON, DISTRICT OF COLUMBIA.

FIRE-CHAMBER.

SPECIFICATION forming part of Letters Patent No. 372,774, dated November8,1887,

Application filed July 24, 1886. Serial No. 208,976. (No model.)

To all whom it may concern:

Be it known that I, EPHRAIM J. STORY, a citizen of the United States,residing in Wash ington, in the District of Columbia, have inventedcertain new and useful Improvements ber which shall be simple andinexpensive,

strong and durable, which shall resist the action of heat, so as to besecure against every tendency to warp or to bend, which shall have largeradiatingsurface, and which shall have means for agitating the contentsof a grate when such grate is reciprocated.

With this object in view the invention consists in various novelelements and in various novel combinations of elements in a fire-chantber, as will be hereinafter indicated in the description and claims.

In the drawings, Figure 1 is a rear perspective elevation of afire-chamber in which my improvements are embodied. Fig. 2 is adetailperspective, partly in section, on the line w 00 of Fig. 3. Fig. 3is aperspectiveview looking toward the interior of the rigl1t-handportion'of the chamber. Fig. 4 is a rear elevation of the centralsection of the fire-chamber, the intersecting radiating andstrengthening ribs being shown in a slightly-modified form. V

The fire-chamber A consists of a central rear section, A, and left andright hand end sections, A? and'A each of the three sections beingformed in a single piece of metal. The rear section, A, at a pointsomewhat below its mid height, is provided with a rearwardlyoverhangingprojection, a, and it is provided also with flaring vertical endportions, a and of", which have orifices o, a horizontal top plate, aand intersecting strengthening and heat-radiating ribs a The endsection, A is composed of the two vertical portions a? and a and theconnecting longitudinally horizontal overhanging portion a the cap 'ortop piece, a, preferably curved as shown, the flaring end portion, a,having orifices 0, the front plate or flange, a, and the intermediatecell-like strengthening and radiating ribs, to.

Within the angle formed at the junction of the lower vertical portion,a, with the connecting longitudinally horizontal portion a U one or moreprojections or protuberances, a. a, each having a perforation to receivea supporting-pin, a, is formed with the end section or casing, A suchprojection or re-enforce serving to strengthen the parts at their pointof union and to furnish a long and firm bearing for the supportingpin,which may be provided with a shoulder to bear against the projection andwitha securing-nut, a. The end section, A as will be readily inferredfrom the foregoing, is the exact counterpart of the section Afl-that is,it is in all respects identical with it in construction and function ofthe parts, and differs only in their opposite arrangement. 4

The overhanging connecting portion a serves in the reciprocation of anygrate or grates which may be applied for use in connection therewith toclear the top surface of the ends of the same, and thus prevent cloggingby the collection of cinders, slag, or coals between the grate and thelower vertical end portion, a". The sections A A A are secured togetherby means of bolts b, which extend through the orifices 0 and o.

It will be understood that, unlike ordinary fire-chambers, this chamberis to be used without alining, the burning fuel resting in directcontact with the metallic walls of the structure.

outer surface'of these metallic walls, whether crossing and supportingeach other at right angles, as best seen in Figs. 1 and 4, or at someother angle, serve to strengthen the plates thus subjected to intenseheat against every tendency to warp or to bend and to reduce to aminimum their liability to fracture; and they also present to thecontiguous airwarming chamber a very extensive heat-radiating surface,each rib extending outwardly from its vertical base a distance ofpreferably not less than an inch and one-half.

In the drawings the overhanging shoulder or clearing projection isrepresented as in two different transverse planes, which meet near thetransverse center of the chamber; but it is obvious that any otherdesired form might be employed without affecting the operation of theparts or the principle of the invention.

The intersecting ribs, integral with the ICO In Figs. 2 and 3 of thedrawings I have represented portions of a reciprocating gratesubstantially like that in United States patent issued to me August 3,1886, and numbered 346,830, and the clearing projections hereindescribed are well adapted to operate advantageously in connection witha grate of that character; but any right-and-left reciprocating grate,extending under these overhanging clearing projections may be employedwith equal advantage in connection with them.

Itwill be understood that, inasmuch as my fire-chamber is composedwholly of metal and intended and adapted to be used without eitherinterior lining or exterior covering, I do not claim any construction inwhich either linings or coverings constitute a part of the structure.

Having thus described my invention, I clain1- 1. A metallic fire-chamberwhich is provided with rear and end exterior integral strengthening andradiating ribs and with an interior overhanging shoulder or clearingprojection, in combination with a reciprocating grate, the contents ofwhich, when the grate is shaken, are agitated by such clearingprojection.

2. A fire-chamber which has rear exterior integral horizontal andvertical strengthening and radiating ribs which overhang a lower portionof the space behind the chamber and end exterior integral horizontal andvertical ribs which overhang the ends of the ashpit.

3. A fire-chamber which has end sections which are provided withintegral intersecting strengthening and radiating ribs and which eachoverhang theash-pit, and which has also a rear section which is providedwith integral intersecting strengthening and radiating ribs and whichoverhangs the space directly behind the ash-pit.

4. The combination, with the rear section, A, having plain inner surfaceand exterior overhanging projection a, of the end sections, A and A eachhaving vertical portions a" a in different planes, which are united by alongitudinally horizontal connecting portion, a which overhangs theash-pit, substantially as and for the purposes set forth.

I 5. In a fire-chamber, an end section whichhasaninwardly-extendinglongitudinallyhori zontal grate-clearingprojection and a perforated enlargement or re-enfl ce beneath and lintegral with such grateclea .ng projection.

I 6. The combination, with he end sections, of the grate supporting pinoeneath the overhanging projection thereof, extending through I eachsection and projecting into the ash-pit,

as shown and described.

7. The herein-described firechaniber, consisting of central rearsection, A, having intersecting strengthening and radiating ribs andrearwardly-overhanging projection a, and

l the end sections, A and A, each having intersecting strengthening andradiating ribs and an inwardly-extending overhanging projection, each ofthese sections, with its ribs l and projection, being formed in a singlepiece, and the entire chamber being adapted to be used without lining orcovering, as set forth.

EPHRAIM J. STORY.

Vitnesses:

W ALTER S. DODGE, V. C. DODGE.

